<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table class="treeTable" :data="catelist" :columns="columns" :selection-type="false" :expand-type="false" show-index border>
        <template slot="isok" slot-scope="scope">
          <i class="el-icon-success" v-if="scope.row.cat_deleted === false" style="color:lightgreen;"></i>
          <i class="el-icon-error" v-else style="color:red;"></i>
        </template>
        <!-- 排序列的插槽作用域 -->
        <template slot="order" slot-scope="scope">
          <el-tag v-if="scope.row.cat_level===0">一级</el-tag>
          <el-tag type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.cat_id)">编辑</el-button>
          <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeCate(scope.row.cat_id)">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="querInfo.pagenum"
      :page-sizes="[3, 5, 10, 15]" :page-size="querInfo.pagesize" layout="total, sizes, prev, pager, next, jumper" :total="total">
      </el-pagination>
    </el-card>
    <!-- 添加分类的对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed">
      <!-- 添加分类的表单 -->
      <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父级分类：">
          <!-- props用来指定对象 -->
          <el-cascader expand-trigger="hover" v-model="selectKeys" :options="parentCateList" clearable
          :props="cascaderProps" @change="parentCateChanged">
          </el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 编辑分类对话框 -->
    <el-dialog title="修改分类" :visible.sync="editCateDialogVisible" width="50%" @close="editCateDialogClosed">
      <el-form ref="editFormRef" :rules="editFormRules" :model="editForm" label-width="80px">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="editForm.cat_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script type="text/ecmascript-6">
export default {
  name:"Cate", 
  data() {
    return {
      querInfo:{//查询分类列表条件
        type:3,
        pagenum:1,
        pagesize:5
      },
      catelist:[],//商品分类的数据列表
      total:0,//总数据条数
      columns:[
        {
          label:"分类名称",
          prop:"cat_name"
        },
        {
          label:"是否有效",
          prop:"cat_deleted",
          //将当前列定义为模板列，类似elementui的table作用域插槽
          type:"template",
          //当前这列模板使用名称
          template:"isok"
        },
        {
          label:"排序",
          prop:"cat_level",
          type:"template",
          template:"order"
        },
        {
          label:"操作",
          type:"template",
          template:"opt"
        },
      ],
      //显示添加分类对话框的显示
      addCateDialogVisible:false,
      addCateForm:{
        //将要添加的分类名称
        cat_name:"",
        //父级分类的id
        cat_pid:0,
        //分类的等级，默认是一级分类
        cat_level:0
      },
      //添加分类表单的验证规则对象
      addCateFormRules:{
        cat_name:[
          { required: true, message: '请输入分类名称', trigger: 'blur' },
        ]
      },
      //父级分类的列表
      parentCateList:[],
      //指定级联选择器的配置对象
      cascaderProps:{
        value:"cat_id",
        label:"cat_name",
        children:"children",
        checkStrictly:true
      },
      //选中的父级分类id数组
      selectKeys:[],
      //显示编辑分类对话框
      editCateDialogVisible:false,
      //查询到该分类信息对象
      editForm:{},
      editFormRules:{
        cat_name:[
          { required: true, message: '请输入分类名称', trigger: 'blur' },
        ]
      }
    }
},
  components:{},
  created(){
    this.getCateList()
  },
  methods:{
    //获取商品分类数据
    async getCateList(){
      const {data:res} = await this.$http.get("categories",{
        params:this.querInfo
      })
      if(res.meta.status!==200){
        return this.$message.error("获取商品分类失败！");
      }
      this.catelist=res.data.result
      this.total = res.data.total
    },
    //监听pagesize改变
    handleSizeChange(newSize){
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    //监听pagenum改变当前页数
    handleCurrentChange(newPage){
      this.querInfo.pagenum = newPage
      this.getCateList()
    },
    //显示分类对话框
    showAddCateDialog(){
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    //获取父级分类(一级二级)的数据列表
    async getParentCateList(){
      const {data:res} = await this.$http.get("categories",{
        params:{ type:2}
      })
      if(res.meta.status !== 200){
        return this.$message.error("获取父级分类数据失败！")
      }
      this.parentCateList = res.data
      console.log(this.parentCateList)
    },
    //选择器发生改变触发
    parentCateChanged(){
      //如果selectKeys长度大于0说明有选中分类
      if(this.selectKeys.length > 0){
        this.addCateForm.cat_pid = this.selectKeys[this.selectKeys.length-1]
        //当前分类的等级
        this.addCateForm.cat_level = this.selectKeys.length
        return
      }
      else
      {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }

    },
    //添加分类按钮
    addCate(){
      this.$refs.addCateFormRef.validate(async (valid)=>{
      if(!valid) return
       const {data:res} = await this.$http.post("categories",this.addCateForm)
       if(res.meta.status !== 201){
         return this.$message.error("添加分类失败！")
       }
       this.$message.success("添加分类成功！")
       this.getCateList()
       this.addCateDialogVisible = false
      })
    },
    //监听对话框关闭事件
    addCateDialogClosed(){
      this.$refs.addCateFormRef.resetFields()
      this.selectKeys = []
      this.addCateForm.cat_pid = 0
      this.addCateForm.cat_level = 0
    },
    //显示编辑对话框
    async showEditDialog(id){
      const {data:res} = await this.$http.get("categories/" + id)
      if(res.meta.status !== 200){
        return this.$message.error("查询用户信息失败!")
      }
      this.editForm = res.data
      this.editCateDialogVisible = true
    },
    //编辑对话框确定按钮
    editCate(){
      this.$refs.editFormRef.validate(async (valid)=>{
        if(!valid) return
        const {data:res} = await this.$http.put("categories/" + this.editForm.cat_id,{
          cat_name:this.editForm.cat_name
        })
        if(res.meta.status !== 200){
          return this.$message.error("修改分类信息失败!")
        }
        this.getCateList()
        this.editCateDialogVisible = false
        this.$message.success("修改分类信息成功!")
      })
    },
    editCateDialogClosed(){
      this.$refs.editFormRef.resetFields()
    },
    //删除分类
    removeCate(id){
      this.$confirm('此操作将永久删除该分类, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(async () => {
          const {data:res} = await this.$http.delete("categories/"+id)
          if(res.meta.status !== 200){
            this.$message.error("删除分类失败!")
          }
          this.getCateList()
          this.$message({
            type: 'success',
            message: '删除成功!'
          })
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消删除'
          })      
        })
    }
  }
}
</script>
<style lang="scss" scoped>
.treeTable{
  margin-top: 15px;
}
.el-cascader{
  width: 100%;
}
</style>